let target = {
  id:"target"
}
let handler = {}
let proxy = new Proxy(target,handler);
console.log(proxy.id);//target
console.log(target.id);//target
//hasOwnProperty()方法在两个地方
console.log(target.hasOwnProperty('id'));//true
console.log(proxy.hasOwnProperty('id'));//true
//Proxy.prototype是undefined
//console.log(target instanceof Proxy);
console.log(target == proxy);//false
console.log(target === proxy);//false